I want to sort an list so it contains all values that are not False

Question

I have this data:

  l = [\'10 20 10 36 30 33 400 400 -1 -1\', 
       \'100 50 50 30 60 27 70 24 -2 -2 700 700\', 
       \'300 1000 80 21 90 18 100 15 110 12